I like the songs in Tarzan Rocks, but when we saw it the musical cast was not very good -- certainly not up to Disney standards. It's been five years at least since we saw it, and I've heard that there were different casts, so perhaps we caught the bad one. A couple the songs were hard to listen to, quite frankly.
Don't think we disliked it b/c we don't like rock -- my DH has played rock and roll for years and my DS is also in a band.